Glaucoma (H40-H42) ICD-10-CM
The H40–H42 section covers glaucoma with 320 ICD-10-CM diagnosis codes, of which 253 are billable in fiscal year 2027. The section is organized into the 2 code ranges listed below.
Code Ranges in This Section 2 ranges · 320 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| H40 | Glaucoma (H40) | 319 | 252 |
| H42 | Glaucoma in diseases classified elsewhere (H42) | 1 | 1 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the H40–H42 Code Range
Glaucoma involves increased pressure inside the eye that the eye cannot withstand without damage to its structure or function. This group also includes suspected glaucoma.
Within H40, H40.0 identifies suspected glaucoma. H40.1 and H40.2 distinguish open-angle from primary angle-closure glaucoma. Other subdivisions distinguish glaucoma linked to eye trauma, inflammation, other eye disorders, or drugs, alongside other and unspecified glaucoma. H42 identifies glaucoma in diseases classified elsewhere.
Some H40 subdivisions use a seventh character to distinguish unspecified, mild, moderate, severe, and indeterminate glaucoma stages.
Questions About This Page
How many codes are in the H40-H42 range?
The H40-H42 range contains 320 ICD-10-CM diagnosis codes in FY 2027. 253 of them are billable, and the rest are category headers that organize the section.
What conditions does H40-H42 cover?
The range covers glaucoma. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
